143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
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/* Definition for thread-local data handling. NPTL/hppa version.
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Copyright (C) 2005-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _TLS_H
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#define _TLS_H 1
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#include <dl-sysdep.h>
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#ifndef __ASSEMBLER__
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# include <stdbool.h>
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# include <stddef.h>
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# include <stdint.h>
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# include <dl-dtv.h>
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#endif /* __ASSEMBLER__ */
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#ifndef __ASSEMBLER__
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/* Get system call information. */
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# include <sysdep.h>
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/* The TP points to the start of the thread blocks. */
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# define TLS_DTV_AT_TP 1
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# define TLS_TCB_AT_TP 0
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/* Get the thread descriptor definition. */
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# include <nptl/descr.h>
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typedef struct
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{
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dtv_t *dtv;
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void *private;
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} tcbhead_t;
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/* This is the size of the initial TCB. */
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# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
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/* This is the size of the TCB. */
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# define TLS_TCB_SIZE sizeof (tcbhead_t)
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/* This is the size we need before TCB */
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# define TLS_PRE_TCB_SIZE sizeof (struct pthread)
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/* Install the dtv pointer. The pointer passed is to the element with
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index -1 which contain the length. */
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# define INSTALL_DTV(tcbp, dtvp) \
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((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1
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/* Install new dtv for current thread. */
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# define INSTALL_NEW_DTV(dtv) \
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({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \
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__tcbp->dtv = dtv; \
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})
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(tcbp) \
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(((tcbhead_t *) (tcbp))->dtv)
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/* Code to initially initialize the thread pointer. This might need
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special attention since 'errno' is not yet available and if the
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operation can cause a failure 'errno' must not be touched. */
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# define TLS_INIT_TP(tcbp) \
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({ __set_cr27(tcbp); NULL; })
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/* Value passed to 'clone' for initialization of the thread register. */
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# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
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/* Return the address of the dtv for the current thread. */
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# define THREAD_DTV() \
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({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \
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__tcbp->dtv; \
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})
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/* Return the thread descriptor for the current thread. */
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# define THREAD_SELF \
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({ struct pthread *__self; \
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__self = __get_cr27(); \
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__self - 1; \
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})
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/* Magic for libthread_db to know how to do THREAD_SELF.
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Our thread pointer is stored in cr27. See asm/elf.h for the offset into
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elf_gregset_t. The thread descriptor is sizeof (struct pthread) away. */
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# define DB_THREAD_SELF \
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REGISTER (32, 32, 53 * 4, -sizeof (struct pthread))
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# include <tcb-access.h>
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static inline struct pthread *__get_cr27(void)
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{
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long cr27;
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asm ("mfctl %%cr27, %0" : "=r" (cr27) : );
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return (struct pthread *) cr27;
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}
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/* We write to cr27, clobber r26 as the input argument, and clobber
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r31 as the link register. */
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static inline void __set_cr27(struct pthread *cr27)
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{
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asm ( "ble 0xe0(%%sr2, %%r0)\n\t"
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"copy %0, %%r26"
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: : "r" (cr27) : "r26", "r31" );
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}
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/* Get and set the global scope generation counter in struct pthread. */
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#define THREAD_GSCOPE_FLAG_UNUSED 0
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#define THREAD_GSCOPE_FLAG_USED 1
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#define THREAD_GSCOPE_FLAG_WAIT 2
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#define THREAD_GSCOPE_RESET_FLAG() \
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do \
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{ int __res \
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= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
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THREAD_GSCOPE_FLAG_UNUSED); \
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if (__res == THREAD_GSCOPE_FLAG_WAIT) \
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lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
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} \
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while (0)
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#define THREAD_GSCOPE_SET_FLAG() \
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do \
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{ \
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THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
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atomic_write_barrier (); \
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} \
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while (0)
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#endif /* !__ASSEMBLER__ */
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#endif /* tls.h */
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